You may not have ever used this exact term before, but I'm sure that most of you know what it is. On his blog over the weekend, Witold Rybczynski wrote about a new architectural term he just learned called: "multiple expression." What it refers to is the use of different architectural styles on a long facade in order for the building to appear as if it's multiple smaller ones.

And today, I would say that this is largely viewed as a positive thing. Typically it is done to "break up a massing" or create a "fine-grained retail experience." In fact, you'll find things like this in some design guidelines. Here's one from Toronto's mid-rise performance standards:

This doesn't explicitly stipulate that architects should use "multiple expressions", but it does suggest that long repetitive facades are suboptimal, and that they should be broken up. But Witold's view is the opposite. He argues that this "bespeaks a lack of confidence, a poverty of the imagination." And he gives the example of Park Crescent in London, designed by architect John Nash.

It's long (well over 60m) and it's repetitive:

Perhaps a good counter example to this would be Mirvish Village in Toronto, which was designed by Henriquez Partners and which has been largely celebrated as a way of creating the feeling of fine-grained urbanism in a larger master-planned development. Here it is on Google, still under construction:

So what is it that makes Mirvish Village a generally desirable outcome in today's planning environment, even though I suspect that most people would still appreciate what John Nash did on Park Crescent back in the early 1800s? Are we saying -- with our guidelines -- that we like Park Crescent, but that we shouldn't do that ever again today?

And to what extent do age and architectural style play into these opinions? Are long repetitive facades over 60m acceptable as long as the architectural style is "Regency" and the buildings aren't too tall? Is modernism the problem? Because here's another example from London: The Alexandra and Ainsworth Estate.

Built in the 1970s, it is a Brutalist housing estate with a largely repetitive design, and even a slight curve reminiscent of Park Crescent:

Does this have confidence and imagination? Witold would probably say no.

In the end, I guess the answer is that it all depends. Guidelines are just that -- guides. They are not set in stone rules that must never be broken under any circumstances. That would be to reduce architecture to a strict science, and there's clearly also an art component to building great cities.

"Multiple expression" is usually done to create the feeling of finer-grained urbanism. But sometimes -- if you're old and regal-looking enough -- the opposite can be okay too.